-Move libdriver to lib/ -Install all boot image services on filesystem to aid restartability
150 lines
3.1 KiB
C
150 lines
3.1 KiB
C
/* queryparam() - allow program parameters to be queried
|
|
* Author: Kees J. Bot
|
|
* 21 Apr 1994
|
|
*/
|
|
#define nil 0
|
|
#include <stddef.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include "queryparam.h"
|
|
|
|
#if EXAMPLE
|
|
struct stat st[2];
|
|
|
|
struct export_param_list ex_st_list[]= {
|
|
QP_VARIABLE(st),
|
|
QP_ARRAY(st),
|
|
QP_FIELD(st_dev, struct stat),
|
|
QP_FIELD(st_ino, struct stat),
|
|
...
|
|
QP_END()
|
|
};
|
|
|
|
struct buf { block_t b_blocknr; ... } *buf;
|
|
size_t nr_bufs;
|
|
|
|
struct export_param_list ex_buf_list[]=
|
|
QP_VECTOR(buf, buf, nr_bufs),
|
|
QP_FIELD(b_blocknr),
|
|
...
|
|
QP_END()
|
|
};
|
|
|
|
struct export_params ex_st= { ex_st_list, 0 };
|
|
struct export_params ex_buf= { ex_buf_list, 0 };
|
|
#endif
|
|
|
|
#define between(a, c, z) ((unsigned) ((c) - (a)) <= (unsigned) ((z) - (a)))
|
|
|
|
static int isvar(int c)
|
|
{
|
|
return between('a', c, 'z') || between('A', c, 'Z')
|
|
|| between('0', c, '9') || c == '_';
|
|
}
|
|
|
|
static struct export_params *params;
|
|
|
|
void qp_export(struct export_params *ex_params)
|
|
{
|
|
/* Add a set of exported parameters. */
|
|
|
|
if (ex_params->next == nil) {
|
|
ex_params->next= params;
|
|
params= ex_params;
|
|
}
|
|
}
|
|
|
|
int queryparam(int qgetc(void), void **poffset, size_t *psize)
|
|
{
|
|
char *prefix;
|
|
struct export_params *ep;
|
|
struct export_param_list *epl;
|
|
size_t offset= 0;
|
|
size_t size= -1;
|
|
size_t n;
|
|
static size_t retval;
|
|
int c, firstc;
|
|
|
|
firstc= c= (*qgetc)();
|
|
if (c == '&' || c == '$') c= (*qgetc)();
|
|
if (!isvar(c)) goto fail;
|
|
|
|
if ((ep= params) == nil) goto fail;
|
|
epl= ep->list;
|
|
|
|
while (c != 0 && c != ',') {
|
|
prefix= "x";
|
|
n= 0;
|
|
|
|
for (;;) {
|
|
while (epl->name == nil) {
|
|
if ((ep= ep->next) == nil) goto fail;
|
|
epl= ep->list;
|
|
}
|
|
if (strncmp(prefix, epl->name, n) == 0) {
|
|
prefix= epl->name;
|
|
while (prefix[n] != 0 && c == prefix[n]) {
|
|
n++;
|
|
c= (*qgetc)();
|
|
}
|
|
}
|
|
if (prefix[n] == 0 && (!isvar(c) || prefix[0] == '[')) {
|
|
/* Got a match. */
|
|
break;
|
|
}
|
|
epl++;
|
|
}
|
|
|
|
if (prefix[0] == '[') {
|
|
/* Array reference. */
|
|
size_t idx= 0, cnt= 1, max= size / epl->size;
|
|
|
|
while (between('0', c, '9')) {
|
|
idx= idx * 10 + (c - '0');
|
|
if (idx > max) goto fail;
|
|
c= (*qgetc)();
|
|
}
|
|
if (c == ':') {
|
|
cnt= 0;
|
|
while (between('0', (c= (*qgetc)()), '9')) {
|
|
cnt= cnt * 10 + (c - '0');
|
|
}
|
|
}
|
|
if (c != ']') goto fail;
|
|
if (idx + cnt > max) cnt= max - idx;
|
|
offset+= idx * epl->size;
|
|
size= cnt * epl->size;
|
|
c= (*qgetc)();
|
|
} else
|
|
if (epl->size == -1) {
|
|
/* Vector. */
|
|
offset= (size_t) * (void **) epl->offset;
|
|
size= (* (size_t *) epl[1].offset) * epl[1].size;
|
|
} else {
|
|
/* Variable or struct field. */
|
|
offset+= (size_t) epl->offset;
|
|
if ((size_t) epl->offset > size) goto fail;
|
|
size-= (size_t) epl->offset;
|
|
if (size < epl->size) goto fail;
|
|
size= epl->size;
|
|
}
|
|
}
|
|
if (firstc == '&' || firstc == '$') {
|
|
retval= firstc == '&' ? offset : size;
|
|
offset= (size_t) &retval;
|
|
size= sizeof(retval);
|
|
}
|
|
if (c != 0 && c != ',') goto fail;
|
|
*poffset= (void *) offset;
|
|
*psize= size;
|
|
return c != 0;
|
|
fail:
|
|
while (c != 0 && c != ',') c= (*qgetc)();
|
|
*poffset= nil;
|
|
*psize= 0;
|
|
return c != 0;
|
|
}
|
|
|
|
/*
|
|
* $PchId: queryparam.c,v 1.1 2005/06/28 14:30:56 philip Exp $
|
|
*/
|